FileManager: Show an inline error message for inaccessible directories

Instead of popping up a message box whenever we can't read an opened
directory, show the error message inside the DirectoryView (as a label)
instead.

This fixes a visual inconsistency where an inaccessible directory would
be selected in the left-side treeview while the previous directory's
contents were still showing on the right.

This also makes keyboard navigation a bit more pleasant since you're
not suddenly interrupted by a message box.

3 files changed, 16 insertions, 12 deletions

diff --git a/Applications/FileManager/DirectoryView.cpp b/Applications/FileManager/DirectoryView.cpp
index 836851e70d..fcce7c178a 100644
--- a/Applications/FileManager/DirectoryView.cpp
+++ b/Applications/FileManager/DirectoryView.cpp
@@ -32,6 +32,7 @@
 #include <LibCore/MimeData.h>
 #include <LibCore/StandardPaths.h>
 #include <LibGUI/InputBox.h>
+#include <LibGUI/Label.h>
 #include <LibGUI/MessageBox.h>
 #include <LibGUI/SortingProxyModel.h>
 #include <serenity.h>
@@ -135,6 +136,9 @@ DirectoryView::DirectoryView(Mode mode)
 
     setup_actions();
 
+    m_error_label = add<GUI::Label>();
+    m_error_label->set_font(m_error_label->font().bold_family_font());
+
     setup_model();
 
     setup_icon_view();
@@ -155,15 +159,20 @@ void DirectoryView::setup_model()
 {
     m_model->set_root_path(Core::StandardPaths::desktop_directory());
 
-    m_model->on_error = [this](int error, const char* error_string) {
+    m_model->on_error = [this](int, const char* error_string) {
+        auto failed_path = m_model->root_path();
         bool quit = false;
         if (m_path_history.size())
             open(m_path_history.at(m_path_history_position));
         else
             quit = true;
 
-        if (on_error)
-            on_error(error, error_string, quit);
+        if (quit)
+            exit(1);
+
+        auto error_message = String::format("Could not read %s:\n%s", failed_path.characters(), error_string);
+        m_error_label->set_text(error_message);
+        set_active_widget(m_error_label);
     };
 
     m_model->on_complete = [this] {
@@ -321,6 +330,8 @@ void DirectoryView::open(const StringView& path)
         model().update();
         return;
     }
+
+    set_active_widget(&current_view());
     model().set_root_path(path);
 }
 
diff --git a/Applications/FileManager/DirectoryView.h b/Applications/FileManager/DirectoryView.h
index 4470e1bb52..e66a1f5fab 100644
--- a/Applications/FileManager/DirectoryView.h
+++ b/Applications/FileManager/DirectoryView.h
@@ -86,7 +86,6 @@ public:
     Function<void(const GUI::ModelIndex&, const GUI::ContextMenuEvent&)> on_context_menu_request;
     Function<void(const StringView&)> on_status_message;
     Function<void(int done, int total)> on_thumbnail_progress;
-    Function<void(int error, const char* error_string, bool quit)> on_error;
 
     enum ViewMode {
         Invalid,
@@ -174,6 +173,8 @@ private:
     Vector<String> m_path_history;
     void add_path_to_history(const StringView& path);
 
+    RefPtr<GUI::Label> m_error_label;
+
     RefPtr<GUI::TableView> m_table_view;
     RefPtr<GUI::IconView> m_icon_view;
     RefPtr<GUI::ColumnsView> m_columns_view;
diff --git a/Applications/FileManager/main.cpp b/Applications/FileManager/main.cpp
index 66f6093434..7f09d0cb00 100644
--- a/Applications/FileManager/main.cpp
+++ b/Applications/FileManager/main.cpp
@@ -540,14 +540,6 @@ int run_in_windowed_mode(RefPtr<Core::ConfigFile> config, String initial_locatio
         open_parent_directory_action->set_enabled(new_path != "/");
     };
 
-    directory_view.on_error = [&](int, const char* error_string, bool quit) {
-        auto error_message = String::format("Could not read directory: %s", error_string);
-        GUI::MessageBox::show(window, error_message, "File Manager", GUI::MessageBox::Type::Error);
-
-        if (quit)
-            exit(1);
-    };
-
     directory_view.on_status_message = [&](const StringView& message) {
         statusbar.set_text(message);
     };